This is a link to a help document for downloading NAIP photography. 
ADMS 2017 USDA GeoSpatial-Ernie.pub (gktechinc.com)

The 2019 user manual has info on how to download and process Landsat and Sentinel data on pages 351-369. It is a bit of a process.
ADMS_2019_User_Manual.pdf (gktechinc.com)

If you are looking for more data and how to process it. I would suggest going to the https://gktechinc.com/data-links/ 
The header to each section is a hyperlink to the website that will have the data described in the area below. Also, below each grouping there is a large GREEN button. This button has the instructions for how to download / process and get the data into ADMS.